Date: Thu, 5 Aug 2010 09:08:45 -0700 From: Artem Belevich <fbsdlist@src.cx> To: "Alex V. Petrov" <alexvpetrov@gmail.com> Cc: freebsd-stable@freebsd.org, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: zpool - low speed write Message-ID: <AANLkTikr77wSY=3OL9pXHS6_Mg%2B141uMOTu-GSKn4oEu@mail.gmail.com> In-Reply-To: <201008051247.43260.alexvpetrov@gmail.com> References: <201008042008.25679.alexvpetrov@gmail.com> <20100805041752.GA89285@icarus.home.lan> <201008051247.43260.alexvpetrov@gmail.com>
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On Wed, Aug 4, 2010 at 9:47 PM, Alex V. Petrov <alexvpetrov@gmail.com> wrot= e: ... >> > vfs.zfs.cache_flush_disable=3D1 >> > vfs.zfs.zil_disable=3D1 >> >> I question both of these settings, especially the latter. =A0Please remo= ve >> them both and re-test your write performance. > > I removed all settings of zfs. > Now it default. > ZFS would throttle writes if it thinks that not enough memory is available. Did you by any chance tinker with VM parameters, too? Could you post output of following commands? sysctl vm |grep kmem sysctl vfs.zfs sysctl kstat.zfs (before and after after you do some of your write speed t= ests) --Artem
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